package com.wc.codeforces.二分.Set;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

/**
 * @Author congge
 * @Date 2024/11/12 16:57
 * @description
 * https://codeforces.com/contest/2029/problem/A
 */
public class Main {
    /**
     * 思路：从小往大删除
     */
    static FastReader sc = new FastReader();
    static PrintWriter out = new PrintWriter(System.out);
    static int L, R, k;

    public static void main(String[] args) {
        int T = sc.nextInt();
        while (T-- > 0){
            L = sc.nextInt();
            R = sc.nextInt();
            k = sc.nextInt();
            int l = L, r = R;
            while (l < r){
                int mid = l + r + 1 >> 1;
                if (mid <= R / k) l = mid;
                else r = mid - 1;
            }
            if (r <= R / k) out.println(r - L + 1);
            else out.println(0);
        }
        out.flush();
    }
}

class FastReader {
    StringTokenizer st;
    BufferedReader br;

    FastReader() {
        br = new BufferedReader(new InputStreamReader(System.in));
    }

    String next() {
        while (st == null || !st.hasMoreElements()) {
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }

    int nextInt() {
        return Integer.parseInt(next());
    }

    String nextLine() {
        String s = "";
        try {
            s = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return s;
    }

    long nextLong() {
        return Long.parseLong(next());
    }

    double nextDouble() {
        return Double.parseDouble(next());
    }

    // 是否由下一个
    boolean hasNext() {
        while (st == null || !st.hasMoreTokens()) {
            try {
                String line = br.readLine();
                if (line == null)
                    return false;
                st = new StringTokenizer(line);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return true;
    }
}

